diff --git a/test/icinga-notification.cpp b/test/icinga-notification.cpp
index 8db93fa50..97f7838a1 100644
--- a/test/icinga-notification.cpp
+++ b/test/icinga-notification.cpp
@@ -19,6 +19,7 @@
 
 #include "icinga/notification.hpp"
 #include <BoostTestTargetConfig.h>
+#include <iostream>
 
 using namespace icinga;